Parker County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 148,222. The county seat is Weatherford. The county was created in 1855 and organized the following year. It is named for Isaac Parker, a state legislator who introduced the bill that established the county in 1855. Parker later fought in the Texas Brigade. Parker County is included in the Dallas-Fort Worth-Arlington metropolitan statistical area.